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Method for directly extracting vanadium from high-calcium vanadium slag by roasting-alkali leaching

A technology of alkali leaching and vanadium slag is applied in the field of direct roasting of high-calcium vanadium slag-alkali leaching vanadium, which can solve problems such as vanadium extraction from high-calcium vanadium slag, and achieve the effects of improving purity, simple operation process and low price.

Inactive Publication Date: 2015-02-18
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the deficiencies of the above-mentioned prior art, what the present invention aims to solve is the problem that the traditional vanadium extraction process cannot be used to extract vanadium from high-calcium vanadium slag, and provides a method for high-calcium vanadium slag, directly roasting without adding any additives, alkali A method for extracting vanadium by liquid leaching, which can increase the leaching rate of vanadium in high-calcium vanadium slag, inhibit the leaching of harmful elements such as phosphorus, and realize efficient and clean vanadium extraction process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] CaO / V 2 o 5 The high-calcium-vanadium slag with a molar ratio of 5 was crushed, sieved with a 200-mesh sieve, and the under-sieve was put into a muffle furnace, and roasted at 950°C for 2.5h. During the roasting process, the furnace door of the muffle furnace is half-opened to ensure that the entire roasting process is in an oxidizing atmosphere. And stir once every 15 minutes during the roasting process to prevent the vanadium slag from sticking during the roasting process, resulting in insufficient oxidation of the vanadium slag. After roasting, take out the vanadium slag clinker and cool it to room temperature in air.

[0028] The roasted vanadium slag clinker is crushed, sieved with a 200-mesh sieve, and the undersize is collected. Measure 48 mL of sodium carbonate solution with a concentration of 160 g / L with a graduated cylinder, first pour 40 mL of sodium carbonate solution into the three-necked bottle, then weigh 4 g of vanadium slag clinker and pour it into ...

Embodiment 2

[0031] CaO / V 2 o 5 The high-calcium-vanadium slag with a molar ratio of 4 was crushed, sieved with a 200-mesh sieve, and the under-sieved material was put into a muffle furnace and calcined at 750 °C for 2 h. During the roasting process, the furnace door of the muffle furnace is half-opened to ensure that the entire roasting process is in an oxidizing atmosphere. And stir once every 15 minutes during the roasting process to prevent the vanadium slag from sticking during the roasting process, resulting in insufficient oxidation of the vanadium slag. After roasting, take out the vanadium slag clinker and cool it to room temperature in air.

[0032]The roasted vanadium slag clinker is crushed, sieved with a 200-mesh sieve, and the undersize is collected. Use a measuring cylinder to measure 32 mL of sodium carbonate solution with a concentration of 100 g / L, first pour 25 mL of sodium carbonate solution into a three-necked bottle, then weigh 4 g of vanadium slag clinker and pour...

Embodiment 3

[0035] CaO / V 2 o 5 The high-calcium-vanadium slag with a molar ratio of 3 was crushed, sieved with a 200-mesh sieve, and the under-sieved material was put into a muffle furnace and calcined at 600 °C for 1.5 h. During the roasting process, the furnace door of the muffle furnace is half-opened to ensure that the entire roasting process is in an oxidizing atmosphere. And stir once every 15 minutes during the roasting process to prevent the vanadium slag from sticking during the roasting process, resulting in insufficient oxidation of the vanadium slag. After roasting, take out the vanadium slag clinker and cool it to room temperature in air.

[0036] The roasted vanadium slag clinker is crushed, sieved with a 200-mesh sieve, and the undersize is collected. Use a graduated cylinder to measure 16 mL of sodium carbonate solution with a concentration of 40 g / L, first pour 10 mL of sodium carbonate solution into a three-necked bottle, then weigh 4 g of vanadium slag clinker and po...

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Abstract

The invention provides a method for directly extracting vanadium from high-calcium vanadium slag by roasting-alkali leaching, which comprises the following steps: 1) crushing and screening high-calcium vanadium slag in which the CaO / V2O5 mole ratio is 3-5; 2) carrying out oxidizing roasting on the screened high-calcium vanadium slag at 600-950 DEG C for 1.5-2.5 hours; 3) crushing and screening the vanadium slag clinker subjected to oxidizing roasting; 4) leaching the screened vanadium slag clinker in an Na2CO3 solution at 65-95 DEG C for 10-180 minutes to extract the vanadium; 5) carrying out solid-liquid separation on the leaching solution, and washing the vanadium slag with a 5-7 wt% Na2CO3 solution 2-3 times while filtering so as to obtain vanadium slag and a vanadium-containing filtrate which are used for subsequent vanadium settling treatment. The method is simple and easy to operate and low in cost; when the method is used for extracting vanadium, the leaching rate of vanadium can be up to 94%, and the leaching rate of the impurity element phosphorus can be down to 11%, thereby enhancing the purity of the vanadium product.

Description

technical field [0001] The invention belongs to the field of extraction and recovery of vanadium resources, and relates to a method for directly roasting high-calcium vanadium slag and extracting vanadium with alkali. [0002] Background technique [0003] As a valuable strategic resource, vanadium is widely used in steel, chemical industry, aerospace, biomedicine and other fields. Vanadium-titanium magnetite is the main mineral resource of vanadium, and my country's vanadium-titanium magnetite resource is very rich. In order to recover vanadium from vanadium-titanium magnetite, represented by the Panxi region, most of the vanadium is extracted by double converter process, that is, vanadium is first extracted in one converter to obtain vanadium slag and semi-steel, and then the semi-steel is poured into another Semi-steel steelmaking is carried out in the converter, and the vanadium slag is subjected to subsequent oxidation roasting and leaching process to extract vanadium...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B3/12C22B34/22
CPCC22B1/02C22B34/22Y02P10/20
Inventor 谢兵闫小满王宁肖仕乱刁江李鸿乂
Owner CHONGQING UNIV
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